Editing the following tag (with right-click > Edit tag) causes Bluefish to crash (no messages):

<img src="11157.gif" width="50%" height="50%" alt="">

The problem seems to be the 50%.

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Possibly related - manually adjusted widths and heights are not preserved when editing the <img> tag. For example, inserting an image might generate this tag:

<img src="11157.gif" width="115" height="143" alt="">

If this edited (either via the tag editor or by direct editing) to

<img src="11157.gif" width="57" height="71" alt="">

then again opening this with the tag editor presets the width and height in the tag editor to the original image values (115,143), not the values currently in the file (57,71).

This is not desirable behaviour - the tag editor should take the current width and height values from the tag being edited, not from the image.